During week 6, twenty countries of the 28 countries reporting have indicated high/medium-intensity transmission and wide geographic spread of influenza activity. Thirteen countries have reported increasing trends and six reported decreasing trends, compared to 22 reporting increasing trends and only one decreasing in the previous week (week 5).

Virological surveillance shows that the proportion of influenza-positive cases among sentinel specimens continues to be high (53%) and is only slightly less than in week 5/2013 (55%).

Since week 40/2012, the proportions of influenza type A and B viruses have remained similar (51% vs. 49%). Among type A viruses, the percentage of A(H1)pdm09 has continued to increase to 65% as compared with 52% in week 2/2013.